<p>Look for qualified this usages in the same class.</p>
<p>Examples:</p>
<pre>
    Negative example:
    // Use `if (!(x >= 628))` to represent that x is less than 628.
    if (!(x >= 628)) {
        // ...
    }
    Positive example:
    // Use `if (x < 628)` to represent that x is less than 628.
    if (x < 628)) {
        // ...
    }
</pre>
